Abstract:
A composition comprising a poly-alkyleneglycol is stablized against molecular degradation and viscosity loss at elevated temperatures by about 0.1 to about 10% by weight of an arylhydroquinone such as p-acetylphenylhydroquinone.
Abstract:
1506129 Ammonium carbamate SNAMPROGETTI SpA 20 April 1976 [23 April 1975] 16012/76 Heading C1A Ammonium carbamate solution is formed by feeding a mixture of ammonium carbonate solution and a gas comprising ammonia, carbon dioxide, and water vapour, at a pressure of from 50 to 300 atmospheres, into a horizontal or substantially horizontal tubular absorption zone maintained under a static pressure. In Fig. 2 the ammonium carbonate solution and gas mixture are fed via lines 2 and 3 to the inlet end of absorber 1, the mixture passes through the bundle of tubes 7 where the gases are absorbed, the carbamate solution is discharged via line 5 which also maintains the desired static resource 6 in the tubular zone. The static pressure is preferably from 0À5 to 5 atmospheres.
Abstract:
A system for automatically suppressing any ground noise present in the detection of periodic phenomena comprising detecting means for detecting the signal occurring just prior to the occurrence of the periodic phenomena, which signal is representative of ground noise, converting means for converting the sensed signal to a usable D.C. level signal, sampling means for sampling the signal resulting from the occurrence of the periodic phenomena, and summation means for algebraically adding the converted D.C. signal to the sampled signal for eliminating any ground noise present in the sampled signal, thereby providing an output signal representative of the periodic output phenomena free of any ground noise.
Abstract:
A novel process for making polymers degradable by the direct action of sunlight is disclosed. The process is based on the addition to the polymer of a compound having the formula: R2R3 ANGLE C= C ANGLE R1R4 in which R1, R2, R3 and R4 are the same or different and are selected from the group consisting of aromatic radicals with the proviso that one or two of them may be selected from the group consisting of hydrogen, alkyl, cycloalkyl and arylalkyl.
Abstract:
A process is described for the separation of C 5 hydrocarbons present, in a quantity ranging from 0.2 to 20 % by weight, in streams prevalently containing C 4 products used for the production of high-octane hydrocarbon compounds, by the selective dimerization of isobutene, characterized in that the dimerization reaction is carried out in the presence of linear and branched alcohols and alkyl ethers in a quantity which is such as to have a molar ratio alcohols/alkyl ethers/isobutene in the feeding higher than 0.01.
Abstract:
Process for the conversion of heavy charges chosen among heavy and extra heavy crude oils, distillation residues, "heavy oils" coming from catalytic treatments, "thermal tars", bitumen from oil sands, coals of various nature and other high boiling charges of hydrocarbon origin known as "black oils", by means of the joint use of at least three of the following process units: deasphalting (SDA1), hydroconversion with catalysts in slurry phase (HT1), distillation or flash (D), characterized by the fact of comprising the following stages: - sending the heavy charge to a deasphalting section (SDA1) in presence of a solvent obtaining two streams: one consisting of Deasphalted Oil (DAO1 from SDA1), the other one containing asphaltenes; - mixing the flow consisting of deasphalted oil (DAO1 from SDA1) with an appropriate hydrogenation catalyst and sending the thus obtained mixture to a hydroprocessing section (HT1) and introducing into it hydrogen or a mixture containing hydrogen and H2S; - mixing the flow consisting of asphaltenes coming out of the deasphalting section (SDA1) with an appropriate hydrogenation catalyst and sending the thus obtained mixture to a second hydroprocessing section (HT2) and introducing into it hydrogen or a mixture containing hydrogen and H2S; - sending both the streams containing the reaction product of the hydroprocessing section (HT1) and the catalyst in the dispersed phase to one or more distillation or flash stages (D9) where the most volatile fractions, including the gases produced in the two hydroprocessing reactions (HT1 and HT2), are separated from the distillation residue (tar) or from the liquid coming out of the flash unit; -sending the distillation residue (tar) or the liquid coming out of the flash unit, containing the catalyst in the dispersed phase rich with metal sulfides, produced because of the demetallization of the charge, and possibly containing coke, to a second deasphalting section (SDA2) in presence of solvents , thus obtaining two streams, one consisting of deasphalted oil (DAO2 from SDA2) and the other consisting of asphaltenes, a part of which, unless some draining takes place, is recycled to the hydroprocessing section (HT1) and the other part is recycled to the second hydroprocessing section (HT2).
Abstract:
Integrated process for the conversion of feedstocks containing coal into liquid products by the joint use of at least the following seven process units: coal liquefaction (CL), flash or distillation of the product obtained from the liquefaction (F), extraction with a solvent to remove the ashes (SDAsh), distillation to separate the solvent (RS), hydroconversion with catalysts in slurry phase (HT), distillation or flash of the product obtained from the hydroconversion (D), deasphalting with a solvent (SDA).